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How much is 30?

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It's about three-tenths the number of Wolves in Yellowstone National Park.
In other words, 30 is 0.2880 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 3.470 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about one-fourth the number of Elements on the Periodic Table.
In other words, 30 is 0.2540 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 3.940 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
It's about one-fifth the number of Union Stations in the United States.
In other words, 30 is 0.2220 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 4.50 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about one-fifth the number of Moons in our Solar System.
In other words, 30 is 0.2050 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 4.880 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about one-fifth the number of John Wayne films.
In other words, 30 is 0.1690 times the count of John Wayne films, and the count of John Wayne films is 5.920 times that amount.
(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)
It's about six times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.20 times 30.
(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)
It's about one-tenth the number of Bones in the Human Body.
In other words, 30 is 0.1460 times the count of Bones in the Human Body, and the count of Bones in the Human Body is 6.850 times that amount.
(adult, excluding sesamoid bones and ossicles)
The adult human body contains 206 bones. A newborn's body contains more bones — 270 — with unfused bone segments in the legs, arms, head, and face.